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Accounting for stock-based compensation (Tables)
6 Months Ended
Jun. 30, 2016
Stock-Based Compensation Expense

Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and six months ended June 30, 2016 and 2015 was as follows (in thousands):

 

     Three months ended June 30,      Six months ended June 30,  
     2016      2015      2016      2015  

Stock-based compensation

   $ 1,355       $ 1,775       $ 2,628       $ 3,778